By themselves, the ST4 minitowers had one of the flattest treble curves I have yet measured.
The measured bass performance of the ST4 was typical for medium-sized systems I have measured over the past few years: below 160 Hz, there was a steady rise down to about 80 Hz, with a rapid rolloff below that point.
The SB3 system curves paralleled those of the ST4 throughout most of the midrange and treble (which is understandable), and the bass response was also surprisingly similar, including the rise down to 80 Hz.
The ST4's woofer was probably not contributing a lot with this kind of hookup (remember, the sub high passes at 100 Hz, while the system's internal crossover for the woofer is only slightly higher, at 135 Hz), but the result still seemed to be a tad better than what I got with the sub and the SB3 systems.
Whether the $800 SB1/SW10 combo sounds better than the $1,000 pair of ST4 systems is debatable.
After the measurements were completed, I hooked up each set of systems one package at a time (ST4 systems alone, SB3 and SB1 systems in combination with the SW10) and listened to a variety of program sources.
The Monaco release, which features jazz playing on an electronic organ, exhibited an excellent soundstage blend with the ST4 systems, but in this case I felt that the two SB systems, in combination with the SW10, were a tad superior.
A more serious comparison involved the ST4 systems against a pair of Dunlavy Cantatas, speakers that cost more than five times as much as the ST4s.
With the Bizet, Bach, and Shostakovitch orchestral tracks, the violin string sounds were very close, but with the ST4 systems sounding more distant, and sometimes with a better sense of stage depth.
The ST4 units exhibited a bit of mid-bass thickness that the Cantatas did not, although this did not prevent me from noticing the deeper low-bass reach of the Cantatas at times.
I also had a chance to compare the ST4 units to the AR Phantom 8.3 systems, which with their dedicated stands cost half again as much as the ST4s.
Later on, I set the ST4, SB1, SC1, and SW10 systems up in my smaller living room, using an Onkyo TX-DS787 receiver.